Answer:
Your answer would be that the sentence above contains a gerund phrase as the object of a preposition.
Step-by-step explanation:
Serving others is a gerund phrase. Gerunds are words that are formed with verbs but act as nouns. This means that they can act as subjects, direct objects, indirect objects, objects of prepositions, and predicate nouns. In this case, the gerund phrase serving others acts as the object of the preposition in.